Fail safe mode, no response from accelerator pedal

Tiny
JIMFARNSLEY
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • 3.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
Engine starts and runs but I cannot accelerate.
Thursday, January 3rd, 2019 AT 11:14 PM

2 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,414 POSTS
The place to start would be with a scan tool. There are multiple items that can cause the car to go into limp mode. From a bad gas pedal to internal transmission failure. Without scanning it and seeing what it shows as a problem you could end up spending a lot of money and still not repairing it.
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Thursday, January 3rd, 2019 AT 11:48 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,273 POSTS
Hello,

I have seen a dirty throttle bore cause this issue creating a correlation loss between the actuator and sensor. I would disconnect the battery service the throttle bore then clear the codes and try it again. Here is a guide to help the service and a video to help clear the codes:

https://www.2carpros.com/articles/throttle-actuator-service

and

https://youtu.be/ahK_eucFi-k

Please let us know what you find. We are interested to see what it is.

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Friday, January 4th, 2019 AT 6:54 PM

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